CIS flow rates through injectors for a '79
10-22-2013, 10:58 AM
#1
Instructor
Thread Starter
CIS flow rates through injectors for a '79
I am currently helping a friend to troubleshoot a loss of power above 4000 rpms.
He has already checked the ignition system and vacuum.
Now he wants to make sure all CIS specs are in order. I have no experience with CIS so I would like to turn to the collected wisdom here.
Before we start the next test session, I would like to have all figures ready. We have the specs for control and system pressure as well as the fuel flow rate at the return line.
We would like to measure the max fuel flow through the injectors by pulling one out and measuring the amount of fuel sprayed while holding the plate fully open but I can't find any data on that delivery rate.
Any CIS experts who can point me in the right direction ?
EDIT: does anyone have the specific fuel consumption curve in g/HP-hour (like the one shown in the full power curve in later cars' owner's manual) for an early car at hand? Or just a single data point at max power?
From this it should be straightforward to calculate the actual flow per minute per injector?
Kurt
------------
90 S4 satin black metallic
OC charter member
He has already checked the ignition system and vacuum.
Now he wants to make sure all CIS specs are in order. I have no experience with CIS so I would like to turn to the collected wisdom here.
Before we start the next test session, I would like to have all figures ready. We have the specs for control and system pressure as well as the fuel flow rate at the return line.
We would like to measure the max fuel flow through the injectors by pulling one out and measuring the amount of fuel sprayed while holding the plate fully open but I can't find any data on that delivery rate.
Any CIS experts who can point me in the right direction ?
EDIT: does anyone have the specific fuel consumption curve in g/HP-hour (like the one shown in the full power curve in later cars' owner's manual) for an early car at hand? Or just a single data point at max power?
From this it should be straightforward to calculate the actual flow per minute per injector?
Kurt
------------
90 S4 satin black metallic
OC charter member
Last edited by kurt_1; 10-22-2013 at 03:23 PM.
10-22-2013, 08:30 PM
#2
Instructor
I don't have specific numbers for our car, but I'm learning a lot with Ferrari folks about CIS.
Try this: http://www.ferrari400parts.com/kjetdownload.php
and this: http://www.ferrari400parts.com/flowm...structions.php
Try this: http://www.ferrari400parts.com/kjetdownload.php
and this: http://www.ferrari400parts.com/flowm...structions.php
10-23-2013, 03:25 AM
#4
Rennlist Member
Specified pump delivery rate is around 1350ml/30 secs for my 83 S - measured at the return line, pump relay bridged. Not sure on a 78, but shouldnt be too much lower..? Dont recall seeing injector delivery rate published anywhere , unlike the common ratings for electronic injectors.
jp 83 Euro S AT 55k
jp 83 Euro S AT 55k
10-23-2013, 07:45 AM
#5
Instructor
Thread Starter
Thanks for the tips and the especially the Ferrari link, some interesting stuff there! Maybe it's not really that important to measure the full load flow, just get the pressures right and the injector flow rates balanced. We'll see
Kurt
------------
90 S4 satin black metallic
OC charter member
Kurt
------------
90 S4 satin black metallic
OC charter member